<template>
<div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
        <!-- 提示 -->
        <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
        <!-- 步骤条 -->
        <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
            <el-step title="基本信息"></el-step>
            <el-step title="商品参数"></el-step>
            <el-step title="商品属性"></el-step>
            <el-step title="商品图片"></el-step>
            <el-step title="商品内容"></el-step>
            <el-step title="完成"></el-step>
        </el-steps>

        <!-- Tab栏 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
            <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                <el-tab-pane label="基本信息" name="0">
                    <el-form-item label="商品名称" prop="goods_name">
                        <el-input v-model="addForm.goods_name"></el-input>
                    </el-form-item>
                    <el-form-item label="商品价格" prop="price">
                        <el-input v-model="addForm.goods_price" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品重量" prop="goods_weight">
                        <el-input v-model="addForm.goods_weight" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品数量" prop="goods_number">
                        <el-input v-model="addForm.goods_number" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品分类" prop="goods_cat">
                        <el-cascader v-model="addForm.goods_cat" :options="cateList" :props="cascaderProps" @change="handleChange"></el-cascader>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品参数" name="1">
                    <!-- 渲染表单的Item项 -->
                    <el-form-item v-for="item in manyTableData" :key="item.attr_id" :label="item.attr_name">
                        <!-- 复选框组 -->
                        <el-checkbox-group v-model="item.attr_vals">
                            <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
                        </el-checkbox-group>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品属性" name="2">
                    <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                        <el-input v-model="item.attr_vals"></el-input>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品图片" name="3">
                    <!-- action: 图片上传的API接口地址 -->
                    <el-upload :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove" :headers="headerObj" list-type="picture" :on-success="handleSuccess">
                        <el-button size="small" type="primary">点击上传</el-button>
                    </el-upload>
                </el-tab-pane>
                <el-tab-pane label="商品内容" name="4">
                    <!-- 富文本编辑器 -->
                    <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                    <!-- 添加商品 -->
                    <el-button type="primary" class="btnAdd" @click="addGoods">添加商品</el-button>
                </el-tab-pane>
            </el-tabs>
        </el-form>
    </el-card>
    <el-dialog title="图片预览" :visible.sync="previewDialogVisible" width="50%">
        <img :src="picPreviewPath" alt="" class="previewImg">
    </el-dialog>
</div>
</template>

<script>
import _ from 'lodash'
export default {
    data() {
        return {
            // 步骤条默认激活 与左侧Tab联动
            activeIndex: '0',
            // 添加商品的表单对象
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                // 商品所属分类数组
                goods_cat: [],
                // 图片的数组
                pics: [],
                // 商品详情描述
                goods_introduce: '',
                attrs: []
            },
            addFormRules: {
                goods_name: [{
                    required: true,
                    message: '请输入商品名称',
                    trigger: 'blur'
                }],
                goods_price: [{
                    required: true,
                    message: '请输入商品价格',
                    trigger: 'blur'
                }],
                goods_weight: [{
                    required: true,
                    message: '请输入商品重量',
                    trigger: 'blur'
                }],
                goods_number: [{
                    required: true,
                    message: '请输入商品数量',
                    trigger: 'blur'
                }],
                goods_cat: [{
                    required: true,
                    message: '请选择商品分类',
                    trigger: 'blur'
                }]
            },
            // 商品列表
            cateList: [],
            // 级联选择器配置
            cascaderProps: {
                expandTrigger: 'hover',
                label: 'cat_name',
                value: 'cat_id',
                children: 'children'
            },
            // 动态参数列表数据
            manyTableData: [],
            // 静态属性列表数据
            onlyTableData: [],
            // 图片上传地址
            uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
            // 图片上传组件的请求对象
            headerObj: {
                Authorization: window.sessionStorage.getItem('token')
            },
            picPreviewPath: '',
            // 图片预览对话框
            previewDialogVisible: false
        }
    },
    created() {
        this.getCateList()
    },
    computed: {
        getCateId() {
            if (this.addForm.goods_cat.length === 3) {
                return this.addForm.goods_cat[2]
            }
            return null
        }
    },
    methods: {
        // 获取商品分类数据列表
        async getCateList() {
            const {
                data: res
            } = await this.$http.get('categories')
            if (res.meta.status !== 200) {
                return this.$message.error('获取商品列表失败！')
            }
            this.cateList = res.data
        },
        // 级联选择器选中项变化时出发
        handleChange() {
            if (this.addForm.goods_cat.length !== 3) {
                this.addForm.goods_cat = []
            }
        },
        beforeTabLeave(activeName, odlActiveName) {
            // 未选中商品分类阻止Tab标签跳转
            if (odlActiveName === '0' && this.addForm.goods_cat.length !== 3) {
                this.$message.error('请先选择商品分类')
                return false
            }
        },
        // Tab标签被选中时触发
        async tabClicked() {
            // 访问动态参数面板
            if (this.activeIndex === '1') {
                const {
                    data: res
                } = await this.$http.get(
                    `categories/${this.getCateId}/attributes`, {
                        params: {
                            sel: 'many'
                        }
                    }
                )
                if (res.meta.status !== 200) {
                    return this.$message.error('获取动态参数列表失败！')
                }
                res.data.forEach(item => {
                    item.attr_vals =
                        item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
                })
                this.manyTableData = res.data
            } else if (this.activeIndex === '2') {
                const {
                    data: res
                } = await this.$http.get(
                    `categories/${this.getCateId}/attributes`, {
                        params: {
                            sel: 'only'
                        }
                    }
                )
                if (res.meta.status !== 200) {
                    return this.$message.error('获取动态参数列表失败！')
                }
                this.onlyTableData = res.data
            }
        },
        // 处理图片预览
        handlePreview(file) {
            this.picPreviewPath = file.response.data.url
            this.previewDialogVisible = true
        },
        // 处理移除图片的操作
        handleRemove(file) {
            // 1.获取将要删除图片的临时路径
            const filePath = file.response.data.tmp_path
            // 2.从pics数组中，找到图片对应的索引值
            const i = this.addForm.pics.findIndex(x => x.pic === filePath)
            // 3.调用splice方法，移除图片信息
            this.addForm.splice(i, 1)
        },
        // 监听图片上传成功事件
        handleSuccess(response) {
            // 1.拼接得到一个图片信息对象 临时路径
            const picInfo = {
                pic: response.data.tmp_path
            }
            // 2.将图片信息对象，push到pics数组中
            this.addForm.pics.push(picInfo)
        },
        // 添加商品
        addGoods() {
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) return this.$message.error('请填写必要的表单项！')
                // 发送请求前：需对提交的表单进行处理goods_cat attrs
                // this.addForm.goods_cat = this.addForm.goods_cat.join(',')
                // 以上写法不对：级联选择器绑定的对象goods_cat要求是数组对象
                // 解决办法: 包：lodash 方法（深拷贝）：cloneDeep(boj)

                // 将this.addForm进行深拷贝
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')

                // 处理动态参数
                this.manyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals.join(' ')
                    }
                    this.addForm.attrs.push(newInfo)
                })
                // 处理静态属性
                this.onlyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals
                    }
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs
                // 发起请求添加商品
                // 商品名称必须是唯一的
                const {
                    data: res
                } = await this.$http.post('goods', form)
                console.log(res);
                if (res.meta.status !== 200) return this.$message.error('添加商品失败！')
                this.$message.success('添加商品成功!')
                this.$router.push('/goods')
            })
        }
    }
}
</script>

<style lang="less" scoped>
.el-checkbox {
    margin: 0 8px 0 0 !important;
}

.previewImg {
    width: 100%;
}

.btnAdd {
    margin-top: 15px
}
</style>
